5sp trans for 4000 Update

Hi folks,
for the folks has or will have problems with their trans, here
is what i found out and what is my intentions.
i called around about 5 different sources from the part vendor
list. even though i had very fine experiece from all of them
from previous part purchase, price was vary significantly in
used or rebuilt trans.
i was looking for 5sp manual for my 85 4000, 1.8 liter, and PAP
had lowest price in both used and rebuilt. used trans were
going anywhere from $350(PAP) - $725, and rebuilt were going
anywhere from $870(PAP) to over $2000. for used, it came with
about 30 day warantee, and for rebuilt, most of them offered 2
year warantee. another thing is freight, it can be from $70 to
$120, depending where you live.
my mechanic found one locally for $300, and will do whole thing
for $750, which is not bad at all. however, he told me to keep
driving until it stops, since it still DRIVES with some noise.
so, I decide to take that chance. I know the trans is in bad
shape, but let us see how long it goes. even i replace with
used, i am gonna keep it only 2 more year or so anyway. i will
do follow up later.
peter yi